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Help with graphics engine

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Hey there, Sir Bob wrote a graphics engine that just simply moves some bitmaps around on the screen. It also displays the fps. What we don''t understand is that on my Pentium 4 1.7GHz 256 RAM running Windows XP the max fps i can get is 37, but on my very low end computer running Windows 98, I can get up to 80 fps. Also, we are using Direct x 8.1 for both computers. Could the problem be in the XP version of direct x? I have all the latest drivers for direct x and my 64 MB GeForce3 video card. With vsync and all the framerate controls disabled, the program easily exceeds 120 fps on a PII350 with no video RAM - provided that machine is running Win98. On machines running WinXP, it still tops out at 30-40 fps, regardless of the specs of said machines. Anybody have any suggestions?? He who laughs, lasts

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How are you drawing your bitmaps? If you''re locking video memory, your performance will probably be destroyed on GeForces but won''t suffer that much on computers with no video memory.

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